Hadoop Cluster Role

Installs and configure Hadoop system (version 2.X) in a cluster of nodes.

Role Variables

The variables that can be passed to this role and a brief description about them are as follows:

# The type of the node: slave or master or resourcemanager or nodemanager or datanode or namenode 
hadoop_type_of_node: slave
# Hadoop base directory to install the software
hadoop_home: /opt/hadoop-2.X
# List of servers to download the hadoop code
hadoop_mirrors: [ "http://mirror.cc.columbia.edu/pub/software/apache/hadoop/core/stable/",
        "http://ftp.osuosl.org/pub/apache/hadoop/core/stable/",
        "http://apache.rediris.es/hadoop/core/stable/",
        "http://apache.uvigo.es/hadoop/common/stable/" ]
# Hadoop version to install
hadoop_version: latest
# A dictionary with a set of properties to set in the core-site.xml
hdfs_props: {}
# A dictionary with a set of properties to set in the yarn-site.xml
yarn_props: {}
# List of slave nodes
hadoop_slave_nodes: "{{ groups['all']|map('extract', hostvars,'ansible_hostname')|list }}"

Example Playbook

This an example of how to install the Cluster:

In the "Worker Nodes"

  roles:
    - { role: 'grycap.hadoop', hadoop_master: 'MASTER_NODE_NAME_OR_IP' }

In the "Manager Node"

  roles:
    - { role: 'grycap.hadoop', hadoop_master: 'MASTER_NODE_NAME_OR_IP', hadoop_type_of_node: 'master'}

Contributing to the role

In order to keep the code clean, pushing changes to the master branch has been disabled. If you want to contribute, you have to create a branch, upload your changes and then create a pull request.
Thanks